multiply defined wcstouq on Linux

[Eric Blake]

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Nelson H. F. Beebe gave me an off-list report of a failure linking on
Linux due to multiply-defined wcstouq and other helper functions from the
glibc headers.

uname:           Linux xxx 2.6.18-92.1.22.el5 #1 SMP Fri Dec 5 09:29:46
EST 2008 i686 GNU/Linux
unspecified glibc version
compiled with gcc4

gcc4 -std=gnu99  -g -O2  -Wl,-rpath,/usr/local/lib -o m4 m4.o builtin.o
debug.o eval.o format.o freeze.o input.o macro.o output.o path.o symtab.o
../lib/libm4.a  -lm /usr/local/lib/libsigsegv.a -lc
../lib/libm4.a(vasnprintf.o): In function `wcstouq':
/usr/include/wchar.h:585: multiple definition of `wcstouq'
../lib/libm4.a(quotearg.o):/usr/include/wchar.h:585: first defined here
../lib/libm4.a(vasnprintf.o): In function `wcstoq':
/usr/include/wchar.h:580: multiple definition of `wcstoq'
../lib/libm4.a(quotearg.o):/usr/include/wchar.h:580: first defined here
...

This seems like a bug in glibc's <wchar.h>, especially since gnulib does
not mess with wcstouq.  However, it would be nice if we could identify
what is causing this failure (incorrectly inlined functions, in particular
due to the change in semantics of static inline between older and newer
gcc to meet C99 semantics?) and work around it in gnulib's replacement
<wchar.h>.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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